| Domain | Definition | ||
| Mining | According to Grubenmann's classification of metamorphic rocks (1904), the uppermost depth zone of metamorphism, characterized by low to moderate temperatures (less than 300 degrees C) and hydrostatic pressures with low to high shearing stress. Modern usage stresses pressure-temperature conditions (low metamorphic grade) rather than the likely depth of zone. Cf: mesozone; katazone. (references) | ||
Source: compiled by the editor from various references; see credits. | Top | ||
